The music alone is called Love Otome Heart. Starting at 6 minutes and 13 seconds of this song, it is the music when Tuxedo Mask appears.

Download address: /search?search= E6818BE38199E3828BE4B999E5A5B3E5BF83amp; restype=-1amp; id=10000001amp; ty=0amp; pattern=0

The song she sings is called Phantom of the Tuxedo. You can download it from KUGOO. You can enter Sailor Moon in the address to search. That’s it